Not all Photoshop study materials have to describe techniques that you will find genuinely useful for the rest of your creative existence. This particular tutorial, for example, details a fun and entertaining way to make a personal logo for a forum. Its pretty simple to follow and shows you what's possible with Photoshop and an inquisitive mind.

If you need to show some compressed files as icon on your website you can try this tutorial which creates a Winzip File Compress Icon. If you don't use winzip you can use another file compressing tool icon like winrar or any other file compressing utility.